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    <li class="nav-header no-margin-top">
      <div class="ttip" data-toggle="tooltip" data-placement="bottom" title="The date that this version of Crypt-Random was released.">
      <span class="relatize">03 Jun 2021 18:31:44 UTC</span>
    </li>
  <li>
    Distribution: <a href="https://metacpan.org/dist/Crypt-Random">Crypt-Random</a>
  </li>
  <li>
    Module version: 1.54
  </li>
  <li>
    <a data-keyboard-shortcut="g s" href="https://metacpan.org/dist/Crypt-Random/source/lib/Crypt/Random.pm">Source</a>
    (<a href="https://metacpan.org/dist/Crypt-Random/source/lib/Crypt/Random.pm?raw=1">raw</a>)
  </li>
  <li>
    <a data-keyboard-shortcut="g b" href="https://metacpan.org/dist/Crypt-Random/source/lib/Crypt">Browse</a>
    (<a href="https://metacpan.org/dist/Crypt-Random/source/lib/Crypt?raw=1">raw</a>)
  </li>
    <li>
      <a data-keyboard-shortcut="g c" href="https://metacpan.org/dist/Crypt-Random/changes">Changes</a>
    </li>
    <li>
      <a class="nopopup" href="https://metacpan.org/dist/Crypt-Random/contribute">How to Contribute</a>
    </li>
    <li>
      <a rel="noopener nofollow" data-keyboard-shortcut="g i" href="https://rt.cpan.org/Public/Dist/Display.html?Name=Crypt-Random">Issues</a>
      (5)
    </li>
    <li>
      <a rel="noopener nofollow" href="http://matrix.cpantesters.org/?dist=Crypt-Random+1.54" title="Matrix">Testers</a>
        <span title="(pass / fail / na)">(<a rel="noopener nofollow" href="https://www.cpantesters.org/distro/C/Crypt-Random.html?oncpan=1&amp;distmat=1&amp;version=1.54&amp;grade=2" style="color: #090">1401</a> / <a rel="noopener nofollow" href="https://www.cpantesters.org/distro/C/Crypt-Random.html?oncpan=1&amp;distmat=1&amp;version=1.54&amp;grade=3" style="color: #900">287</a> / <a rel="noopener nofollow" href="https://www.cpantesters.org/distro/C/Crypt-Random.html?oncpan=1&amp;distmat=1&amp;version=1.54&amp;grade=4">0</a>)</span>
    </li>
    <li>
      <a rel="noopener nofollow" href="http://cpants.cpanauthors.org/release/VIPUL/Crypt-Random-1.54">Kwalitee</a>
    </li>
    <li>
      <div class="ttip" data-toggle="tooltip" data-placement="bottom" title="The # people with an indexing permission on Crypt-Random who have released something to CPAN in the last 2 years (i.e. the # people likely able to release critical fixes in a timely manner)">
      Bus factor: 0
      </div>
    </li>
    <li>
      <a rel="noopener nofollow" href="http://cpancover.com/latest/Crypt-Random-1.54/index.html">97.59% Coverage </a>
    </li>
    <li>
      License: unknown
    </li>
    <li class="nav-header">Activity</li>
    <li>
<div class="activity-graph">
    <img src="https://metacpan.org/dist/Crypt-Random/activity.svg?res=month" />
    <div class="comment">24 month</div>
</div>
    </li>
    <li class="nav-header">Tools</li>
    <li>
      <a itemprop="downloadUrl" href="https://cpan.metacpan.org/authors/id/V/VI/VIPUL/Crypt-Random-1.54.tar.gz">
      Download (<span itemprop="fileSize">21.84KB</span>)</a>
    </li>
    <li>
      <a href="https://explorer.metacpan.org/?url=%2Fmodule%2FVIPUL%2FCrypt-Random-1.54%2Flib%2FCrypt%2FRandom.pm">
        MetaCPAN Explorer
      </a>
    </li>
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      <a href="https://metacpan.org/dist/Crypt-Random/permissions">
        Permissions
      </a>
    </li>
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      <a href="https://metacpan.org/dist/Crypt-Random/releases.rss">
        Subscribe to distribution
      </a>
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        Install Instructions
      </button>
    </li>
    <li>
      <form action="https://metacpan.org/search">
        <input type="hidden" name="q" value="dist:Crypt-Random">
        <input type="search" name="q" placeholder="Search distribution" class="form-control tool-bar-form">
        <input type="submit" style="display: none">
      </form>
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    <li>
      <form action="https://grep.metacpan.org/search">
        <input type="hidden" name="qd" value="Crypt-Random">
        <input type="hidden" name="source" value="metacpan">
        <input type="search" name="q" placeholder="grep distribution" class="form-control tool-bar-form">
        <input type="submit" style="display: none">
     </form>
    </li>
    <li class="version-jump">
<select onchange="document.location.href=&#39;/release/&#39;+this.value+&#39;/view/lib/Crypt/Random.pm&#39;" class="form-control tool-bar-form">
  <option disabled selected>Jump to version</option>
<option
  disabled
  value="VIPUL/Crypt-Random-1.54"
>1.54
  (VIPUL on 2021-06-03)</option>
<option
  
  value="VIPUL/Crypt-Random-1.53"
>1.53
  (VIPUL on 2021-06-03)</option>
<option
  
  value="VIPUL/Crypt-Random-1.52"
>1.52
  (VIPUL on 2018-12-22)</option>
<option
  
  value="VIPUL/Crypt-Random-1.51"
>1.51
  (VIPUL on 2018-12-22)</option>
<option
  
  value="VIPUL/Crypt-Random-1.25"
>1.25
  (VIPUL on 2005-03-07)</option>
<option
  
  value="VIPUL/Crypt-Random-0.17"
>0.17
  (VIPUL on 1999-04-09)</option>
<optgroup label="BackPAN">'
<option
  
  value="VIPUL/Crypt-Random-1.24"
>1.24
  (VIPUL on 2005-03-07)</option>
<option
  
  value="VIPUL/Crypt-Random-1.23"
>1.23
  (VIPUL on 2004-06-02)</option>
<option
  
  value="VIPUL/Crypt-Random-1.22"
>1.22
  (VIPUL on 2004-06-01)</option>
<option
  
  value="VIPUL/Crypt-Random-1.21"
>1.21
  (VIPUL on 2004-05-24)</option>
<option
  
  value="VIPUL/Crypt-Random-1.20"
>1.20
  (VIPUL on 2004-05-21)</option>
<option
  
  value="VIPUL/Crypt-Random-1.13"
>1.13
  (VIPUL on 2003-03-11)</option>
<option
  
  value="VIPUL/Crypt-Random-1.12"
>1.12
  (VIPUL on 2003-01-08)</option>
<option
  
  value="VIPUL/Crypt-Random-1.11"
>1.11
  (VIPUL on 2001-07-12)</option>
<option
  
  value="VIPUL/Crypt-Random-1.10"
>1.10
  (VIPUL on 2001-07-09)</option>
<option
  
  value="VIPUL/Crypt-Random-1.08"
>1.08
  (VIPUL on 2001-06-23)</option>
<option
  
  value="VIPUL/Crypt-Random-1.07"
>1.07
  (VIPUL on 2001-06-22)</option>
<option
  
  value="VIPUL/Crypt-Random-0.34"
>0.34
  (VIPUL on 2001-04-17)</option>
<option
  
  value="VIPUL/Crypt-Random-0.33"
>0.33
  (VIPUL on 2001-03-05)</option>
<option
  
  value="VIPUL/Crypt-Random-0.32"
>0.32
  (VIPUL on 2001-02-14)</option>
<option
  
  value="VIPUL/Crypt-Random-0.23"
>0.23
  (VIPUL on 2000-09-18)</option>
<option
  
  value="VIPUL/Crypt-Random-0.18"
>0.18
  (VIPUL on 1999-10-13)</option>
</optgroup>
</select>
    </li>
    <li class="version-diff">
<select onchange="document.location.href='/release/VIPUL/Crypt-Random-1.54/diff/' + encodeURIComponent(this.value) + '/lib/Crypt/Random.pm'
" class="form-control tool-bar-form">
  <option disabled selected>Diff with version</option>
<option
  disabled
  value="VIPUL/Crypt-Random-1.54"
>1.54
  (VIPUL on 2021-06-03)</option>
<option
  
  value="VIPUL/Crypt-Random-1.53"
>1.53
  (VIPUL on 2021-06-03)</option>
<option
  
  value="VIPUL/Crypt-Random-1.52"
>1.52
  (VIPUL on 2018-12-22)</option>
<option
  
  value="VIPUL/Crypt-Random-1.51"
>1.51
  (VIPUL on 2018-12-22)</option>
<option
  
  value="VIPUL/Crypt-Random-1.25"
>1.25
  (VIPUL on 2005-03-07)</option>
<option
  
  value="VIPUL/Crypt-Random-0.17"
>0.17
  (VIPUL on 1999-04-09)</option>
<optgroup label="BackPAN">'
<option
  
  value="VIPUL/Crypt-Random-1.24"
>1.24
  (VIPUL on 2005-03-07)</option>
<option
  
  value="VIPUL/Crypt-Random-1.23"
>1.23
  (VIPUL on 2004-06-02)</option>
<option
  
  value="VIPUL/Crypt-Random-1.22"
>1.22
  (VIPUL on 2004-06-01)</option>
<option
  
  value="VIPUL/Crypt-Random-1.21"
>1.21
  (VIPUL on 2004-05-24)</option>
<option
  
  value="VIPUL/Crypt-Random-1.20"
>1.20
  (VIPUL on 2004-05-21)</option>
<option
  
  value="VIPUL/Crypt-Random-1.13"
>1.13
  (VIPUL on 2003-03-11)</option>
<option
  
  value="VIPUL/Crypt-Random-1.12"
>1.12
  (VIPUL on 2003-01-08)</option>
<option
  
  value="VIPUL/Crypt-Random-1.11"
>1.11
  (VIPUL on 2001-07-12)</option>
<option
  
  value="VIPUL/Crypt-Random-1.10"
>1.10
  (VIPUL on 2001-07-09)</option>
<option
  
  value="VIPUL/Crypt-Random-1.08"
>1.08
  (VIPUL on 2001-06-23)</option>
<option
  
  value="VIPUL/Crypt-Random-1.07"
>1.07
  (VIPUL on 2001-06-22)</option>
<option
  
  value="VIPUL/Crypt-Random-0.34"
>0.34
  (VIPUL on 2001-04-17)</option>
<option
  
  value="VIPUL/Crypt-Random-0.33"
>0.33
  (VIPUL on 2001-03-05)</option>
<option
  
  value="VIPUL/Crypt-Random-0.32"
>0.32
  (VIPUL on 2001-02-14)</option>
<option
  
  value="VIPUL/Crypt-Random-0.23"
>0.23
  (VIPUL on 2000-09-18)</option>
<option
  
  value="VIPUL/Crypt-Random-0.18"
>0.18
  (VIPUL on 1999-10-13)</option>
</optgroup>
</select>
    </li>

    <li>
<ul class="dependencies">
  <li class="nav-header">Dependencies</li>
  <li><a href="https://metacpan.org/pod/Class::Loader" title="Class::Loader" class="ellipsis">Class::Loader</a></li>
  <li><a href="https://metacpan.org/pod/Math::Pari" title="Math::Pari" class="ellipsis">Math::Pari</a></li>
  <li><a href="https://metacpan.org/pod/Statistics::ChiSquare" title="Statistics::ChiSquare" class="ellipsis">Statistics::ChiSquare</a></li>
  <li><i class="ttip" title="dynamic_config enabled">and possibly others</i></li>
  <li>
    <hr>
  </li>
  <li>
    <a href="https://metacpan.org/module/Crypt::Random/requires">Reverse dependencies</a>
  </li>
  <li>
    <a href="http://deps.cpantesters.org/?module=Crypt%3A%3ARandom">CPAN Testers List</a>
  </li>
  <li>
    <a href="https://cpandeps.grinnz.com/?dist=Crypt-Random">Dependency graph</a>
  </li>
</ul>
    </li>
    <li class="nav-header">Permalinks</li>
    <li>
      <a href="https://metacpan.org/release/VIPUL/Crypt-Random-1.54/view/lib/Crypt/Random.pm">This version</a>
    </li>
    <li>
      <a href="./Crypt::Random.html">Latest version</a>
    </li>
    <li>
<div class="plussers">
<div class="nav-header">++ed by:</div>
<div>
    1 non-PAUSE user
</div>
</div>
    </li>
    <li>
    </li>
              </ul>
            </div>
          </nav>
          <div class="content-navigation">
<div class="breadcrumbs">
  <span>
    <a data-keyboard-shortcut="g a" rel="author" href="https://metacpan.org/author/VIPUL" class="author-name">Vipul Ved Prakash</a>
  </span>
  <span>&nbsp;/&nbsp;</span>
  <div class="release dist-release status-latest maturity-released">
    <span class="dropdown"><b class="caret"></b></span>
<select onchange="document.location.href=&#39;/release/&#39;+this.value+&#39;/view/lib/Crypt/Random.pm&#39;" class="">
<option
  selected
  value="VIPUL/Crypt-Random-1.54"
>1.54
  (VIPUL on 2021-06-03)</option>
<option
  
  value="VIPUL/Crypt-Random-1.53"
>1.53
  (VIPUL on 2021-06-03)</option>
<option
  
  value="VIPUL/Crypt-Random-1.52"
>1.52
  (VIPUL on 2018-12-22)</option>
<option
  
  value="VIPUL/Crypt-Random-1.51"
>1.51
  (VIPUL on 2018-12-22)</option>
<option
  
  value="VIPUL/Crypt-Random-1.25"
>1.25
  (VIPUL on 2005-03-07)</option>
<option
  
  value="VIPUL/Crypt-Random-0.17"
>0.17
  (VIPUL on 1999-04-09)</option>
<optgroup label="BackPAN">'
<option
  
  value="VIPUL/Crypt-Random-1.24"
>1.24
  (VIPUL on 2005-03-07)</option>
<option
  
  value="VIPUL/Crypt-Random-1.23"
>1.23
  (VIPUL on 2004-06-02)</option>
<option
  
  value="VIPUL/Crypt-Random-1.22"
>1.22
  (VIPUL on 2004-06-01)</option>
<option
  
  value="VIPUL/Crypt-Random-1.21"
>1.21
  (VIPUL on 2004-05-24)</option>
<option
  
  value="VIPUL/Crypt-Random-1.20"
>1.20
  (VIPUL on 2004-05-21)</option>
<option
  
  value="VIPUL/Crypt-Random-1.13"
>1.13
  (VIPUL on 2003-03-11)</option>
<option
  
  value="VIPUL/Crypt-Random-1.12"
>1.12
  (VIPUL on 2003-01-08)</option>
<option
  
  value="VIPUL/Crypt-Random-1.11"
>1.11
  (VIPUL on 2001-07-12)</option>
<option
  
  value="VIPUL/Crypt-Random-1.10"
>1.10
  (VIPUL on 2001-07-09)</option>
<option
  
  value="VIPUL/Crypt-Random-1.08"
>1.08
  (VIPUL on 2001-06-23)</option>
<option
  
  value="VIPUL/Crypt-Random-1.07"
>1.07
  (VIPUL on 2001-06-22)</option>
<option
  
  value="VIPUL/Crypt-Random-0.34"
>0.34
  (VIPUL on 2001-04-17)</option>
<option
  
  value="VIPUL/Crypt-Random-0.33"
>0.33
  (VIPUL on 2001-03-05)</option>
<option
  
  value="VIPUL/Crypt-Random-0.32"
>0.32
  (VIPUL on 2001-02-14)</option>
<option
  
  value="VIPUL/Crypt-Random-0.23"
>0.23
  (VIPUL on 2000-09-18)</option>
<option
  
  value="VIPUL/Crypt-Random-0.18"
>0.18
  (VIPUL on 1999-10-13)</option>
</optgroup>
</select>
    <a data-keyboard-shortcut="g d" class="release-name" href="https://metacpan.org/dist/Crypt-Random">Crypt-Random-1.54</a>
  </div>
<span class="river-gauge-gauge">
  <svg width="24px"
       height="15px"
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       xmlns="http://www.w3.org/2000/svg"
       xmlns:xlink="http://www.w3.org/1999/xlink">

    <g>
      <title>        River stage two &#10;
          • 7 direct dependents &#10;          • 10 total dependents
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  <div class="toc-header"><strong>Contents</strong></div>
<ul>
  <li><a href="./Crypt::Random.html#NAME">NAME</a></li>
  <li><a href="./Crypt::Random.html#VERSION">VERSION</a></li>
  <li><a href="./Crypt::Random.html#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="./Crypt::Random.html#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="./Crypt::Random.html#BLOCKING-BEHAVIOUR">BLOCKING BEHAVIOUR</a></li>
  <li><a href="./Crypt::Random.html#HARDWARE-RNG">HARDWARE RNG</a></li>
  <li><a href="./Crypt::Random.html#METHODS">METHODS</a></li>
  <li><a href="./Crypt::Random.html#DEPENDENCIES">DEPENDENCIES</a></li>
  <li><a href="./Crypt::Random.html#BIBLIOGRAPHY">BIBLIOGRAPHY</a></li>
  <li><a href="./Crypt::Random.html#AUTHOR">AUTHOR</a></li>
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<h1 id="NAME">NAME</h1>

<p>Crypt::Random - Cryptographically Secure, True Random Number Generator.</p>

<h1 id="VERSION">VERSION</h1>

<pre><code> $Revision: 1.11 $
 $Date: 2001/07/12 15:59:47 $</code></pre>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> use Crypt::Random qw( makerandom ); 
 my $r = makerandom ( Size =&gt; 512, Strength =&gt; 1 ); </code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>Crypt::Random is an interface module to the /dev/random device found on most modern unix systems. It also interfaces with egd, a user space entropy gathering daemon, available for systems where /dev/random (or similar) devices are not available. When Math::Pari is installed, Crypt::Random can generate random integers of arbitrary size of a given bitsize or in a specified interval.</p>

<h1 id="BLOCKING-BEHAVIOUR"><a id="BLOCKING"></a>BLOCKING BEHAVIOUR</h1>

<p>The /dev/random driver maintains an estimate of true randomness in the pool and decreases it every time random strings are requested for use. When the estimate goes down to zero, the routine blocks and waits for the occurrence of non-deterministic events to refresh the pool.</p>

<p>When the routine is blocked, Crypt::Random&#39;s read() will be blocked till desired amount of random bytes have been read off of the device. The /dev/random kernel module also provides another interface, /dev/urandom, that does not wait for the entropy-pool to recharge and returns as many bytes as requested. For applications that must not block (for a potentially long time) should use /dev/urandom. /dev/random should be reserved for instances where very high quality randomness is desired.</p>

<h1 id="HARDWARE-RNG"><a id="HARDWARE"></a>HARDWARE RNG</h1>

<p>If there&#39;s a hardware random number generator available, for instance the Intel i8x0 random number generator, please use it instead of /dev/random!. It&#39;ll be high quality, a lot faster and it won&#39;t block! Usually your OS will provide access to the RNG as a device, eg (/dev/intel_rng).</p>

<h1 id="METHODS">METHODS</h1>

<dl>

<dt id="makerandom()"><a id="makerandom"></a><b>makerandom()</b></dt>
<dd>

<p>Generates a random number of requested bitsize in base 10. Following arguments can be specified.</p>

<dl>

<dt id="Size"><b>Size</b></dt>
<dd>

<p>Bitsize of the random number.</p>

</dd>
<dt id="Strength-0-||-1"><a id="Strength"></a><a id="Strength-0---1"></a><b>Strength</b> 0 || 1</dt>
<dd>

<p>Value of 1 implies that /dev/random should be used for requesting random bits while 0 implies /dev/urandom.</p>

</dd>
<dt id="Device"><b>Device</b></dt>
<dd>

<p>Alternate device to request random bits from.</p>

</dd>
<dt id="Uniform-0-||-1"><a id="Uniform"></a><a id="Uniform-0---1"></a><b>Uniform</b> 0 || 1</dt>
<dd>

<p>Value of 0 (default) implies that the high bit of the generated random number is always set, ensuring the bitsize of the generated random will be exactly Size bits. For uniformly distributed random numbers, Uniform should be set to 1.</p>

</dd>
</dl>

</dd>
<dt id="makerandom_itv()"><a id="makerandom_itv"></a><b>makerandom_itv()</b></dt>
<dd>

<p>Generates a random number in the specified interval. In addition to the arguments to makerandom() following attributes can be specified.</p>

<dl>

<dt id="Lower"><b>Lower</b></dt>
<dd>

<p>Inclusive Lower limit.</p>

</dd>
<dt id="Upper"><b>Upper</b></dt>
<dd>

<p>Exclusive Upper limit.</p>

</dd>
</dl>

</dd>
<dt id="makerandom_octet()"><a id="makerandom_octet"></a><b>makerandom_octet()</b></dt>
<dd>

<p>Generates a random octet string of specified length. In addition to <b>Strength</b>, <b>Device</b> and <b>Verbosity</b>, following arguments can be specified.</p>

<dl>

<dt id="Length"><b>Length</b></dt>
<dd>

<p>Length of the desired octet string.</p>

</dd>
<dt id="Skip"><b>Skip</b></dt>
<dd>

<p>An octet string consisting of characters to be skipped while reading from the random device.</p>

</dd>
</dl>

</dd>
</dl>

<h1 id="DEPENDENCIES">DEPENDENCIES</h1>

<p>Crypt::Random needs Math::Pari 2.001802 or higher.</p>

<h1 id="BIBLIOGRAPHY">BIBLIOGRAPHY</h1>

<dl>

<dt id="1-random.c-by-Theodore-Ts&#39;o.-Found-in-drivers/char-directory-of-the-Linux-kernel-sources."><a id="1"></a><a id="random.c-by-Theodore-Ts-o.-Found-in-drivers-char-directory-of-the-Linux-kernel-sources"></a>1 random.c by Theodore Ts&#39;o. Found in drivers/char directory of the Linux kernel sources.</dt>
<dd>

</dd>
<dt id="2-Handbook-of-Applied-Cryptography-by-Menezes,-Paul-C.-van-Oorschot-and-Scott-Vanstone."><a id="2"></a><a id="Handbook-of-Applied-Cryptography-by-Menezes--Paul-C.-van-Oorschot-and-Scott-Vanstone"></a>2 Handbook of Applied Cryptography by Menezes, Paul C. van Oorschot and Scott Vanstone.</dt>
<dd>

</dd>
</dl>

<h1 id="AUTHOR">AUTHOR</h1>

<p>Vipul Ved Prakash, &lt;mail@vipul.net&gt;</p></div>

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